Arylalkylbarbituric acid.



I alcohol.

UNITED STATES PATENT OFFICE.

HEINRICH HOERLEINQ OF VOHWINKEL, NEAR ELCBER-FELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERFEIJD, GERMANY, A

CORPORATION OF GERMANY.

ARYLALKYLBARBITURIG ACID.

No Drawing Specification of Letters Patent.

Patented May 7, 1912.

Application filed September 6, 1911. Serial No. 647,903.

(B H or alkyl, Rzaryl) which have proved to be. hypnotics, an average dose being from 5; to 1} gram. They v are white crystals scarcely soluble in water forming soluble salts with alkalis. The process for their production consists in condensing aryl substituted malonic acid esters with urea in the presence of sodium alcoholate e. 9.-

In 7 order to illustrate the new process morefully the following example is giv a, the parts being by weight :250 parts of phenyl-methyl-malonic acid ester (:1 mol.) are added to a solution of 69 parts of sodium (:3 mol.) in 1200 parts of absolute 90 parts of urea (=1.5 mol.) are added thereto and the mixture is heated to boiling in a vessel provided with a reflux condenser during 6 hours. The sodium salt precipitates. It-i's filtered off and diluted in water. From this solution the free acid is precipitated by neutralization with hydrochloric acid.

My new substance crystallizes from water in the shape of white leaflets melting in 220 C. It possesses the property of forming salts with many metals e, g. the alkali metals, or-thecaleium, the hydrogen of the NH group being replaced by the metal. It, may be either used in the acid or salt form.

-The" sodium 'salt is a. white crystalline powder easily soluble in' water,

The pheny]propylbarbituric acid melts at 190 C.,' the para-1nethoxyphenylethylbarbituric acid melts at 202 (1., the phenylbenzylbarbituric acid melts at 235 (1, the phenylbarbitn'ric acid melts at 250 C.

I claim 1. The herein described arylbarbituric acids, being white crystals scarcely soluble in water, forming soluble salts with alkalis; and being valuable hypnotics, substantially as described;

2. The herein described arylalkylbarbituric acids of the following general formula CO-NH being .white crystals scarcely soluble in water, forming soluble salts with alkalis; and being valuable hypnotics, substantially as described.

3. The herein described phenylalkylba-rbituric acids of the following general formula:

being white crystals scarcely soluble in water, forming soluble salts with alkalis; and being valuable hypnotics, substantially as described.

4. The herein described phenylmethyl,

barbituric acid of the formula CH t -r o co 0Ha i- I CO-NH crystallizing from water in the shape of white leafletsmelting at 220 (I forming salts with alkali metals'and calcium; and being a Valuable hypnotic, substantially as described.

In testimony whereof I have hereunto set, 'my hand in the presence of two subscribing 

